Pumps A and B

Pump A fill the tank for 12 minutes, pump B for 24 minutes. How long will take to fill the tank if he is only three minutes works A and then both pumps A and B?

Correct result:

x =  9 min

Solution:

1/12 x + 1/24 (x-3) = 1

1/12•x + 1/24•(x-3) = 1

3x = 27

x = 9

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